Myelography in patients with medulloblastoma.

Unsuspected metastatic medulloblastoma involving the spinal cord was detected by myelography in 2 of 3 patients with newly diagnosed medulloblastoma. Myelography revealed unsuspected spinal cord metastases in an additional patient with recurrent medulloblastoma in the posterior fossa. The authors suggest that myelography be performed prior to radiotherapy in all patients with either primary medulloblastoma or recurrence in the posterior fossa.